Problems with german language

I've got a problem with the german languagefile. When I select german for an account, only 50% of all icons in cPanel have text showed with it, the eMail-Manager for example is unusable, because the important things like Add/Delete Accounts are missing (x Theme). When I try to download the languagefile in WHM, the Server only gives back an empy document. I checked via SSH, the languagefile is present and in the right place, when I edit the file in WHM all translations are shown... but it simply does not work.

Anybody any idea what could be causing this / what I could do /check ?